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Wingspan 25-35 mm.
Flight period March to April.
The female of this moth where the female is apterous, or wingless.and can be found crawling The male has a distinctive way of resting, with the wings overlapping. Occurring in March and April, when the females may be found crawling on tree-trunks at night, and the males can be attracted to light.
It is fairly well distributed over most of Britain and reasonably common. The pale green larvae feed on a range of deciduous trees, including hawthorn (Crataegus), oak (Quercus) and fruit trees.